5.Construction of the digital engine
1. The main components of the digital engine are:
a. An internally and externally geared rotary piston 1 (RK1) forming the output,
b. At least two externally geared rotary pistons 2 (RK2) of a smaller diameter
c. An engine housing, in which both rotary pistons are supported (see Fig. 1).
2. The individual pistons of the digital engine are formed by the teeth of the internal gearing of rotary piston 1 and the teeth of the external gearing of rotary pistons 2.
3. Said teeth are set in each case at an angle of 45° and have slightly helicoidally shaped flanks.
4. The external gearing of rotary piston 1 connects the engine to the transmission.
5. The preparation, compression and power chambers are formed by the tooth spaces, the
internal contour of which corresponds precisely to the tooth shape.
6. The combustion chambers are formed by through-bores in the rotary pistons, wherein a combustion chamber is associated with each tooth space.
7. Said combustion chambers are kept sealingly closed during their rotation over a specific angle-of-rotation range by the housing walls of the digital engine.
8. Before the meshing a first connection channel for each rotary piston is provided in the housing walls. Said connection channel flow-connects the tooth space rotating past it to a combustion chamber and fills the latter with compressed air and/or with fuel mixture.
9. Behind the meshing a second connection channel for each rotary piston is provided in the housing walls. Said connection channel likewise flow-connects the combustion chamber rotating past it to one of the succeeding tooth spaces.
10. Situated in the housing walls in each case before and behind the meshing are an exhaust opening as well as an intake opening, which lies opposite the latter and is connected to an air or fuel mixture supply.
11. Both openings are successively flow-connected in each case to the tooth space rotating past.
12. The intake opening overlaps the opposing exhaust opening only over a partial angular range.
Mode of operation of the digital engine
1. A tooth space rotating past the intake opening is filled with combustion air or a fuel-air mixture.
2. The reduction of the volume of the filled tooth space as a result of the ensuing meshing of the rotary pistons subsequently leads to compression of the combustion air or fuel-air mixture.
3. Compression is effected gradually into the connection channel 1 situated before the meshing.
4. At the end of compression, as a result of the rotation of the rotary piston 1 said connection channel is flow-connected to the combustion chamber and fills the latter with the compressed medium.
5. The combustion chamber is then held sealingly closed on its way to the connection channel 2.
6. The mixture preparation and start of combustion occur during the period of displacement to the connection channel 2 - 5th phase!
7. After reaching the connection channel 2 the highly pressurized medium expands out of the combustion chamber, through the connection channel 2 into the tooth space exiting from the meshing region and there performs work which results in the rotation of the rotary pistons.
8. The exhaust gases under a slight overpressure, on reaching the exhaust opening, escape from the tooth space, wherein by virtue of the partial overlap of exhaust opening and intake opening the gas exchange is effected dynamically - similarly to the two-stroke engine.
9. 5-Phase method
The working sequence is therefore effected in a modified 5-phase method:
Vaporization, mixture preparation and combustion
*********Essential features of the 5- phase method********
1. The chronological and spatial separation of the entire mixture preparation and the combustion process from the known four-stroke operation as well as the introduction of a combustion phase as a "fifth phase".
2. An up to twelve-fold lengthening of the available period for mixture preparation and combustion.
3. A substantially isochoric combustion process
Main advantages of the 5-phase method
1. Improved vaporization, mixing and then complete combustion of the fuel.
2. Achievement of higher maximum as well as optimum rotational speeds, thereby enabling increased performance without altering the overall size of the engine.
3. An improvement of emission values is achieved by the new configuration of the combustion process.
4. Lower production costs.